Copy SK_V12.ZIP into the Stonekeep main directory (this should be
  C:\INTRPLAY\STONKEEP).

You can either use the RUNME.BAT batch file from the Stonekeep main directory
  or you can type PKUNZIP -d -o SK_V12.ZIP and then press <ENTER> from the
  Stonekeep main directory.

If DOS then type SK and press <ENTER>.
If Windows 95 then double-click on Stonekeep PIF file (skull with
  black background).
